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pytest-server-fixtures: Support large pids in xvfb #250

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pytest-server-fixtures: Support large pids in xvfb #250

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5 changes: 4 additions & 1 deletion pytest-server-fixtures/pytest_server_fixtures/xvfb.py
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,10 @@ class XvfbServer(object):

def __init__(self):
tmpdir = mkdtemp(prefix='XvfbServer.', dir=Workspace.get_base_tempdir())
for servernum in range(os.getpid(), 65536):
pid_max = 65536
with open('/proc/sys/kernel/pid_max') as pid_max_file:
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Is this guaranteed to exist on all Linux distributions? We should probably safely fall back to 65536 if the file doesn't exist.

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We do fall back, it's set before we open the /proc file. That /proc file was added sometime in 2.5, so it should exist, but it may throw an exception if /proc isn't mounted -- but we probably have bigger problems in that case.

pid_max = int(pid_max_file.read())
for servernum in range(os.getpid(), pid_max):
if os.path.exists('/tmp/.X{0}-lock'.format(servernum)):
continue
self.display = ':' + str(servernum)
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